Antique Shopping in Japan. A brief guide

I recently returned (reluctantly) from an 18 day holiday to Japan.  This comprised of a 4 day stay in Tokyo, 2 nights in Takayama, 2 in Kanazawa, 3 in Nara and 4 in Kyoto (plus one in the airport hotel at Osaka which isn't worth discussing further).  The purpose of this trip was primarily a…